Air compressor



Sept. 24, 1929. P. F. PRICE AIR COMPRESSOR 4 Sheets-Sheet 1 Filed March21, 1928 ATTORNEY Filed March 21, 1928 4 Sheets-Sheet 2 P. F. PRICE AIRCOMPRESSOR -Filed March 21, 1928 4 Sheets-Sheet INVENTOR ATTOR NEY Sept.24, 1929.

Sept. 24, 1929. P. F. PRICE I AIR COMPRESSOR Filed March 21. 1928 4Sheets-Shee 4 Fj rd? INVENTOR ATTORNEY Patented Sept. 24, 19 29 UNITEDSTATES PETER F. PRICE, .OF BENTLEY, MICHIGAN AIR COMPRESSOR Applicationfiled March 21, 1928. Serial No. 263,512.

This invention relates to an air compressor, the general object of theinvention being to provide a compressor of small size so that it can bereadily held in the hands and used for inflating tires and for otherpurposes.

Another object of the invention is to provide an electric motor and acompressor, with means for driving the same from the motor, with acasing enclosing the parts.

Another object of the invention is to form the compressor of a rotarycylinder carrying member having a piston in each cylinder, with astationary eccentric having an annular groove. therein to receiveportions of the piston rods to cause the reciprocatory movement of thepistons as the cylinder carrying member revolves around the eccentric.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawingsand specifically pointed out in the appended claims.

In describing my invention; in detail, reference will be had to theaccompanying drawings wherein like characters denotelike orcorresponding parts throughout the several views, and in which partsbroken away.

Figure 2 is a view of the nozzle end of the device.

Figure 3 is a section on line 33 of Figure 1.

Figure 4 is a longitudinal sectional view through the device.

Figure 5 is a section on line 55 of F igure 4.

Figure 6 is a section on line 66 of Fig ure 4. v

Figure 7 is a section on line 77 of Figure 4. I

Figure 8 is a section on line 88 of Figure 5.

Figure 9 is a section on line 9-9 of Figure 6. Y

Figure 10 is a section on line 1010 of Figure 1. Figure 11 is a sectionon line 11-11 of Figure 3. v 4

Figure 12 is a view in elevation of the center plate 37 In these views,the numeral 1 indicates a caslng which is so shaped that it can bereadily held in the hands and this casing has one end closed and a cap 2closes the other end, the cap being fastened to the casing by the screws3. The cap is provided with the holes 4 and the casing with the holes 5so that an can pass into the casing and some of these holes act topermit access to the parts for adjustment and oiling purposes. A nozzlemember 6 is fastened to the cap and has a chamber 7 and a passage 8therein, the passage 8 connecting the chamber with the nozzle outlet 9in which is placed the gasket 10 and the pin 11, the pin acting tounseat valves of tires so that air can pass from the device into thetire. A gasket 12 is placed in the nozzle member and the cap td, preventleakage from the chamber 7.

A partition plate 13 has its flange connected with portions of the innerwall of the casing, intermediate the ends of the-easing by the screws 14and plates 15 fastened to the walls of the casing and engaging slots inthe flange of the partition plate, prevent rotary movement of thepartition plate.

A pair of U-shaped members 16 is arranged in the rear part of the casingand the limbs of each member are connected with the partition plate. Themembers are arranged at right angles to each other and their hights areconnected together at their centers. Holes are formed in these bightsand in the partition plate to receive the bushings 17 which formbearings for the pintles 18 of the rotor 19 of the electric motor, thefield carrying ring 20 of which is fastened to the limbs of the members16. Brackets 21, fastened to the sides of the casing and engaging thelimbs of the members 16, act to brace said members. Supports 22 on thebights of the members 16 carry the brushes 23 for the rotor.

The conductors 24 enter the rear part of the casing from the conduit 25and these conductors are connected with the contacts 26 on the block 27of insulating material and the conductors 28 leading to the brushes areconnected with the contacts 29 on the block,

- openin one of these contacts 29 being arranged under and spaced from acontact 26 and the two pairs of contacts are adapted to be bridged toclose the circuit by the pair of contacts 30 carried by the switch arm31 which is pivoted to the rear end of the casing and has a knob 32 atone end thereof passing through a slot 33 in the rear end of the casingso that the arm can be moved by hand to open and close the switch. Aspring 34 guides the arm and holds it in adjusted-position.

The compressor, shown generally at A, is arranged in the front part ofthe casing between the partition plate and the cap and said compressorcomprises a ring member 35 having the cylinders 36 formed therein andthe center plates 37 and 38 which have their peripheries fastened to thering member. The compressor is rotatably supported on a stationary shaft39 fastened at its rear end to a bracket 40 which is secured to thepartition plate and this shaft engages bearing formed in the plates 37and 38. An eccentrlc 41 is keyed to the shaft and is located in thespace formed by the plates 37 and 38. This eccentric is formed with anannular groove 42 which is engaged by the T- shaped heads of-the pistonrods 43 which are pivoted by the threaded pins 44 in the extensions 45of the pistons 46. The extensions 45 of the pistons are each ofconsiderable width with their inner portions forming guides which engageguideways 47 formed on the inner faces of the plates 37 and 38.

A cup washer 48 is connected with each piston 46 in such a manner thatair can pass the washer on the suction stroke of each piston, but thewasher will be expanded bythe air in the cylinder on the compressionstroke so that air cannot escape past the washer.

The air entering the casing through the holes therein will pass to thecylinders through v the holes 49 in the plate 37 onthe suction strokesof the pistons. The compressed air will pass through the diagonallyarranged ports 50 in the front wallsof thecylinders when the pressure ineach cylinder is great enough to unseat the valve 51 of cup shape andwhich covers the outer end of each port. Each cup-shaped valve iscarried by a spring arm 52 which is connected to a bracket 53' fastenedto the front face of the ring member 35, a coils ring 54 arrangedbetween the arm and the bracket, tending to hold the valve 51 on itsseat. The air passing through the ports 50 enters a chamber formed by acovering member 55 fastened to the ring member and from this chamber,the .air passes through a tube 56 into the chamber 7 ofthe nozzle memberso that it can pass through the passage 8 to the nozzle part 9. The tube56 rotates with the compressor and it passes through a acking gland 57carried by the inner part 0 the cap and the 'nut 58 of which can beadjusted through the openings 4 in the ca A gear 59 is keyed to thefront pintle 18 of the rotor 19 and meshes with a large gear 60 on astub shaft 61 carried by the partition plate and a small gear 62 isfastened tothe gear 60 and meshes with a ring gear 63 fastened to therear part of the ring member 35. Thus the compressor is rotated from themotor by these gears.

I prefer to make the eccentric 42 of two halves bolted together asshown, and the ends of the cylinders are covered by the plates 64.

From the foregoing it will be seen that I have provided a simple form ofcompressor, the motor and compressor parts of which are enclosed in asingle casing. When the motor is in operation, the compressor will berotated on the stationary shaft 39 through tons thereof will bereciprocated, as their rods 43 pass around the eccentric groove in theeccentric 41. Thus air will be drawn into the cylinders of thecompressor on the suction strokes of the pistons and this air will beforced through the ports 50 on the compression strokes, the compressedair entering the chamber formed by the covering member 55 and passingthrough the tube 56 into the nozzle member.

It is thought from the foregoing description that the advantages andnovel features of my invention will be readily apparent. It is to beunderstood that I may make changes in the construction and in thecombination and arrangement of the several parts, provided that suchchanges fall within the scope of the appended claim.

What I claim is A device of the class described comprising a casing, apartition 1plate therein dividing the casing into'two c ambers, a pairof U- shaped members in one chamber, one member bein arranged at rightangles to the other an the ends of the limbs of the members beingconnected with the partition plate,

bearings carried by the bi hts of said mem-' bers and by the partition pate, a motor havm its rotor jeurnaled in said bearings, a

fie d carrying ring connected with the for controlling linders, rodsconnected having enlarged inner 1 of the U-sha ed members, brushes suported: aped members, a circuit or the.

ends engaging the groove in the eccentric, each piston aving .acup-shaped washer thereon for permitting air to enter the cy1- inder onthe suction stroke and to be compressed in the cylinder on thecompression stroke, each cylinder having a discharge port, a springpressed valve controlling each port, a chamber forming member connectedwith the compressor and enc10sing,-the' alves and ports, a tubeconnected with said member and extending to one end of the casing,packing means for the tube, a nozzle member connected with said end ofthe casing and receiving the air from the tube and gearing connectingthe motor with the compressor.

PETER F. PRICE.

